deploy app outsite Tomcat_install_dir

Hi all I want to deploy 1 web application in directory outsite Tomcat_install_dir but I ca'nt. For example : Tomcat_install_dir : d:\Tomcat I want to put my application in : c:\myapp I did like this : I config in web.xml: <context path = "/myapp" docbase = "c:\myapp" reloadble = "true"> </context> But it dosen't work. please help me! thanks